In the scene where Eddie first goes to the hotel in Beverly Hills, and overhears the guy being rejected for a room because he has no reservation.

Now he goes up to the counter, and starts to ask for HIS room... just as he starts to mention that he is getting refused himself, the camera goes to a shot of the desk person, and the back of the head of Eddie Murphy. This is where you have to look careful. As Eddie is speaking, most people will look at the look on the face of the man behind the counter... but instead, watch the jaw movement of Eddie Murphy. You can clearly tell that the words he is speaking do NOT match the words that are coming out of his mouth.